Means for operating exhaust-valves.



No. 873,747. PATENTED DEC. 17, 1907.

0] 0. HEDSTROM.

MEANS FOR OPERATING EXHAUST VALVES. APPLICATION FILED MAR. 28, 1,907.

nnirnn STATES PATENT orniion.

CARL O. HEDSTROM, OF SPRINGFIELD, MASSACHUSETTS.

MEANS FOR OPERATING XHAUST-VALVES.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed'May 2a 1907. Serial No. 365.136.

To all whom. it'mwy concern:

Be it known that I, CARL OSCAR Ham STROM, a citizen of the United'States of America, residing at Springfield, in the county of Il ampden and State of Massachusetts,

have invented new and useful Improvements in Means for Operating Exhaust-Valves, of

the/timing mechanism, that is, either to ad-,

vance or retard the making and breaking of the spark'circult.

This invention relates to improvementsshown in my prior LettersPatent of the United States dated July 12, 1904 numbered 765,138 and also to the structure disclosed in my prior application for United States Letters Patent filedJanua-ry 19, 1907 under SerialNo. 353,121. r

With these objectsin view, the invention will be'fullydescribed in' the bodv of the specification.

In the drawings forming part of this application, Figure 1 is a perspective view of a portion of the handle-bar, steering-head,

handle-bar grip and circuit closin device, as

shown in my aforesaid prior United States patent. Fig. 2 is a side elevation of the valve-release mechanism of an internal combustion engine showing a portion of the easing removed and disclosing the -means for operating the exhaust valve-rods and also showing the timing mechanism by which the make and break device is opened and closed, and the spark advanced or retarded asdisclosed in my prior application referred to above, and also showing my unprovements by which one exhaust valve can be operatedbefore the other. viewof the exhaust can.

Referring to the drawings in detail, a designates the steering head of the motor cycle; which is rotatably therefrom is a flexible shaft de'si ated as a whole by the letter (Z for operatmg the circuit-cl'osing disk e which-is made of some in Fig. 2.

:Fig, 3 is a detail suitable insulating material and is rotatably secured tothe steering-head.

Moving with the disk e is an auxiliary lever f that is operated by the flexible shaft (1, the

disk 0 being provided with a circuit-closing piece 9 that is engaged by the brush it,

Connected to the lever f and extending rearwardly therefrom is a link 6 shown also at the point to the casing Z1 that carries the make and break lever m which has at its lift-eam 0. Bymeans of the link i the casing k can be rotated, whereby the making and breaking of the electric circuit will be ad: vaneed or retarded.

Extending inwardly from the casing k is a rod p that is adapted for reciprocation through the walls of the casing q of the mo tor. The inner end of this rod p normally engages a cam rthatis pivoted atthe point This link is pivotally connected lower end the rider n for engaging the double s. The upper edge of the cam r engages a roller or stop t that is carried by the reciprocating lift-cam a which is provided with two laterally projecting portions 1) and w, the

projection w being disposed in a lower hori- I I zontal plane than theprojection v.

a" and y designate two lift-arms that are I pivoted on the pin 2 that is secured to the motor casing and carry at their outerends rollers 2 and 2 which normally engage an exhaust cam 3 that is operated from the engine shaft whereby the-valve operating rods 4 are operated; but when it is desired to prevent the operation oi the motor, that is to destroy or partially destroy the compression in the ends of the cylinders, the link '1') is operated and the rod p moves the cam 1 which is rotated about its pivot s and ele-' vates the earn a which, in turn, causes the arms at and y to be carried away from the cam 3 and consequently the rods 4 are elevated and the exhaust valves opened.

The above description relates partially to matter shown in my prior United States Letters Patent, and'application for Letters Patent above referred to, and is given here for the purpose of rendering this improvement more clear. y

Referring more particularly to the specific improvements and objects of this invention,.'

it Willbe observed that the roller 2 engages the. projectionv of the lift-cam a while the other roller 2 does not normally engage the I projection w of the eani u, that is, a space 5 is left between the right-hand roller 2 and the projection w otthe cam, as shown. The eileet of" this construction is that the lift-arm a: will be operated and elevated first or in advance of the arm y when the link i is operated from the grip c on the handle-bar with the result that the compression in one of the- -cylinders is wholly or partially destroyed,

thus causing the engine to slow down.

Upon a further rotation of the handlebar grip 0 both of the lift-arms 5c and y are operated and consequently both exhaust valves by means of the rods 4: At the same time the disk 6 has been rotated so that the contact piece 9 is carried away from the brush h thereby breaking the electric ignition circuit and the engine prevented fronrfurther operation and allowed to gradually come to a stop.

handle-bar grip and simultaneously retard the spark make and break mechanism which is carried by the casing L and also when it is desired to bring the engines to a stand-still to operate both of the exhaust valves and break the electric circuit completely! IVhat claim, is: v

1. The combination with the exhaust valves of an internal combustion engine, a lift-cam having a'plurality of arms, one of the armsbeing so arranged in relation to the connecting means between the liftecam and exhaust valves thatone of-the exhaust valves is operated in advance of the other when 'the I lift-cam is operated, as described.

.2. The combination with the exhaust valves or an internal cornbustionengine, a lift-cam provided with. oppositely disposed arms and in dill'erent lanes, the arms being located at one end 0 the operating means for the exhaust valves, whereby when the lift-earn is operatedone of the exhaust valves will be operated in advance of the other, as

described. 1 a

3. The combination with the exhaust valves of an internal combustion engine, a lift-cam, means thereon for supporting the operative eonnectionbetweenthe exhaust valves and lift-cam, the means being so arranged that one of the exhaustwalves will be operated in advance of the other, as described.

4. In combination with the exhaust valves of an internal combustion engine, an exhaust cam, a lift-cam, mnans normally engaging the exhaust cam and located. between the exhaust valves and engaging the lift-cam, a cam for operating the lift-cam whereby the exhaust valves are independently operated.

5. In combination with the valves of an'internal combustion engine, an exhaust cam, a lift-cam, means normally en gaging the exhaust cam and, located between the exhaust valves and engaging the lift-cam a cam for operating the lift-eam,said means having one arm engaging the lift-cam and another arm spaced. therefrom,- whereby upon movement of the hit-cam one arm' will be operated in advance of the other arm, as described.

6. In combination with the exhaust valves of an internal combustion engine, a

exhaust lift-cam having supporting portions thereon,

a cam engaging the lift-cam and operable from the timing mechanism, means engaging the supporting portions and located between the lift-cam and the exhaust-valves, the

means being so arranged that one of the valves will be operated in advance of the other. I,

i 7 In combination with the valves of an internal combustion engine," a lift-cam having nuans thereon arranged in diil'erent planes for supporting arms, said arms being operable by said cams, a roller carried by the lift-cam, a cam engaging the roller and so disposed. that its line ol action is vertical and normal to the roller, whereby 'the arms Will be operated one in advance ofthe other, its-described.

S. In combination with valves of an internal combustion engine, a

lift-camhaving means thereon arranged in' diilerent planes for supporting arms, said arms being. operable by said cam, a roller carried by the lil't-e'am, a cam engaging the roller and so disposed that its lineot action is vertical and normal to the roller, whereby the arms will be operated one in advanee of. the other, and means connected with the timing mechanism for operating the last mentioned cam, as described. v

CARL 0. HEDSTROM Witnesses: K.;I. CLEMONS, H. W. Bowen.

exhaust the exhaust 

